rt/tst-aio7.c

   1 /* Test for AIO POSIX compliance.
   2    Copyright (C) 2001,02, 03 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <aio.h>
  20 #include <error.h>
  21 #include <errno.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25
  26
  27 /* We might wait for 3 seconds, so increase timeout to 10 seconds.  */
  28 #define TIMEOUT 10
  29
  30
  31 #define TEST_FUNCTION do_test ()
  32 static int
  33 do_test (void)
  34 {
  35   int result = 0;
  36   int piped[2];
  37
  38   /* Make a pipe that we will never write to, so we can block reading it.  */
  39   if (pipe (piped) < 0)
  40     {
  41       perror ("pipe");
  42       return 1;
  43     }
  44
  45   /* Test for aio_cancel() detecting invalid file descriptor.  */
  46   {
  47     struct aiocb cb;
  48     int fd = -1;
  49
  50     cb.aio_fildes = fd;
  51     cb.aio_offset = 0;
  52     cb.aio_buf = NULL;
  53     cb.aio_nbytes = 0;
  54     cb.aio_reqprio = 0;
  55     cb.aio_sigevent.sigev_notify = SIGEV_NONE;
  56
  57     errno = 0;
  58
  59     /* Case one: invalid fds that match.  */
  60     if (aio_cancel (fd, &cb) != -1 || errno != EBADF)
  61       {
  62         if (errno == ENOSYS)
  63           {
  64             puts ("no aio support in this configuration");
  65             return 0;
  66           }
  67
  68         puts ("aio_cancel( -1, {-1..} ) did not return -1 or errno != EBADF");
  69         ++result;
  70       }
  71
  72     cb.aio_fildes = -2;
  73     errno = 0;
  74
  75     /* Case two: invalid fds that do not match; just print warning.  */
  76     if (aio_cancel (fd, &cb) != -1 || errno != EBADF)
  77       puts ("aio_cancel( -1, {-2..} ) did not return -1 or errno != EBADF");
  78   }
  79
  80   /* Test for aio_fsync() detecting bad fd, and fd not open for writing.  */
  81   {
  82     struct aiocb cb;
  83     int fd = -1;
  84
  85     cb.aio_fildes = fd;
  86     cb.aio_offset = 0;
  87     cb.aio_buf = NULL;
  88     cb.aio_nbytes = 0;
  89     cb.aio_reqprio = 0;
  90     cb.aio_sigevent.sigev_notify = SIGEV_NONE;
  91
  92     errno = 0;
  93
  94     /* Case one: invalid fd.  */
  95     if (aio_fsync (O_SYNC, &cb) != -1 || errno != EBADF)
  96       {
  97         puts ("aio_fsync( op, {-1..} ) did not return -1 or errno != EBADF");
  98         ++result;
  99       }
 100
 101     if ((fd = open ("/dev/null", O_RDONLY)) < 0)
 102       error (1, errno, "opening /dev/null");
 103
 104     cb.aio_fildes = fd;
 105     errno = 0;
 106
 107     /* Case two: valid fd but open for read only.  */
 108     if (aio_fsync (O_SYNC, &cb) != -1 || errno != EBADF)
 109       {
 110         puts ("aio_fsync( op, {RO..} ) did not return -1 or errno != EBADF");
 111         ++result;
 112       }
 113
 114     close (fd);
 115   }
 116
 117   /* Test for aio_suspend() suspending even if completed elements in list.  */
 118   {
 119 #define BYTES 8
 120     const int ELEMS = 2;
 121     int i, r, fd;
 122     static char buff[BYTES];
 123     char name[] = "/tmp/aio7.XXXXXX";
 124     struct timespec timeout;
 125     static struct aiocb cb0, cb1;
 126     struct aiocb *list[ELEMS];
 127
 128     fd = mkstemp (name);
 129     if (fd < 0)
 130       error (1, errno, "creating temp file");
 131
 132     if (unlink (name))
 133       error (1, errno, "unlinking temp file");
 134
 135     if (write (fd, "01234567", BYTES) != BYTES)
 136       error (1, errno, "writing to temp file");
 137
 138     cb0.aio_fildes = fd;
 139     cb0.aio_offset = 0;
 140     cb0.aio_buf = buff;
 141     cb0.aio_nbytes = BYTES;
 142     cb0.aio_reqprio = 0;
 143     cb0.aio_sigevent.sigev_notify = SIGEV_NONE;
 144
 145     r = aio_read (&cb0);
 146     if (r != 0)
 147       error (1, errno, "reading from file");
 148
 149     while (aio_error (&(cb0)) == EINPROGRESS)
 150       usleep (10);
 151
 152     for (i = 0; i < BYTES; i++)
 153       printf ("%c ", buff[i]);
 154     printf ("\n");
 155
 156     /* At this point, the first read is completed, so start another one on
 157        the read half of a pipe on which nothing will be written.  */
 158     cb1.aio_fildes = piped[0];
 159     cb1.aio_offset = 0;
 160     cb1.aio_buf = buff;
 161     cb1.aio_nbytes = BYTES;
 162     cb1.aio_reqprio = 0;
 163     cb1.aio_sigevent.sigev_notify = SIGEV_NONE;
 164
 165     r = aio_read (&cb1);
 166     if (r != 0)
 167       error (1, errno, "reading from file");
 168
 169     /* Now call aio_suspend() with the two reads.  It should return
 170      * immediately according to the POSIX spec.
 171      */
 172     list[0] = &cb0;
 173     list[1] = &cb1;
 174     timeout.tv_sec = 3;
 175     timeout.tv_nsec = 0;
 176     r = aio_suspend ((const struct aiocb * const *) list, ELEMS, &timeout);
 177
 178     if (r == -1 && errno == EAGAIN)
 179       {
 180         puts ("aio_suspend([done,blocked],2,3) suspended thread");
 181         ++result;
 182       }
 183
 184     /* Note that CB1 is still pending, and so cannot be an auto variable.
 185        Thus we also test that exiting with an outstanding request works.  */
 186   }
 187
 188   return result;
 189 }
 190
 191 #include "../test-skeleton.c"